Firstly need to quote for the correct upgrade with admin team, please see the following.

Note licence may vary as required for each company. (we need this for a product key)
Disconnect the computer from internet completely, then go to Settings > System > Activation > Change product key, enter the generic pro key: VK7JG-NPHTM-C97JM-9MPGT-3V66T
It will prompt you to restart eventually, once restarted, your computer will be upgraded to Pro but not activated. Then you go back to the same Settings place, enter your own pro key this time.. make sure you are connected to the internet this time.
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